Volume 2-05, Chapter 3 - City of Wichita

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Section 3.1 - Stormwater Management Controls Overview Structural Control Alternative TSS Removal Suitability Site Applicability Implementation Considerations Physiographic Factors/Soils Special Considerations Other Issues OK Bioretention Area Stormwater Wetland Proprietary Treatment Gravity Separator Alum Treatment Green Roof X Modular Porous Paver System Porous Pavement X High Cost High Cost High Cost X To provide additional pollutant removal capabilities in an attempt to better meet the target removal, bioretention could be used to treat the parking lot and driveway runoff. The bioretention will provide some TSS removal while improving the aesthetics of the site. The site drainage system could be designed so the bioretention drains to the extended detention micropool pond for additional treatment. If milder sloped turf areas are provided, such as along the sides of the parking lots, vegetated swales and filters could be added to the list of acceptable controls for additional treatment if not restricted by soil permeability. Finally, modular porous pavers would be a good choice for the occasional overflow parking that a church typically receives during weekly services. The low infiltration rate of site soils could be overcome by adding an underdrain to the pavers. 3.1.4 On-Line Versus Off-Line Structural Controls 3.1.4.1 Introduction Structural stormwater controls are designed to be either “on-line” or “off-line.” Figure 3-1 shows an example of an off-line sand filter and an on-line enhanced swale. On-line facilities may provide treatment of all or part of the WQ v and may provide control of all or part of the CP v . They may be designed to control flood flows; if not, they are designed to receive and safely pass the entire range of storm flows up to the 100-year discharge. Off-line facilities are designed to receive only a specified flow rate or volume through the use of a flow regulator (i.e. diversion structure, flow splitter, etc). Flow regulators are typically Page 3 - 14 Volume 2, Technical Guidance
Section 3.1 - Stormwater Management Controls Overview used to divert all or a portion of the WQ v to an off-line structural control sized and designed to treat and control that portion of the WQ v . After the design runoff flow has been treated and/or controlled, it is returned to the conveyance system. Flow Regulators Flow regulation to off-line structural stormwater controls can be achieved by either: • Diverting the WQ V or other specific maximum flow rate to an off-line structural stormwater control, or • Bypassing flows in excess of the design flow rate. The peak water quality flow rate (Q wq ) is used as a design parameter to calculate the peak flow rate of the WQ v and is calculated using the procedure found in Chapter 4. Flow regulators can be flow splitter devices, diversion structures, or overflow structures. Examples are shown in Figures 3-2, 3-3 and 3-4. Figure 3-1 Example of On-Line vs Off-Line Structural Controls Volume 2, Technical Guidance Page 3 - 15
Page 1 and 2: CHAPTER 3 STORMWATER CONTROLS TABLE
Page 3 and 4: Chapter 3 - Table of Contents 3.2.8
Page 5 and 6: Chapter 3 - Table of Contents LIST
Page 7 and 8: Section 3.1 - Stormwater Management
Page 19: Section 3.1 - Stormwater Management
Page 31 and 32: Section 3.2.1 - Stormwater Pond 3.2
Page 33 and 34: Section 3.2.1 - Stormwater Pond Fig
Page 35 and 36: Section 3.2.1 - Stormwater Pond For
Page 37 and 38: Section 3.2.1 - Stormwater Pond •
Page 39 and 40: Section 3.2.1 - Stormwater Pond 1'
Page 45 and 46: Section 3.2.1 - Stormwater Pond 3.2
Page 47 and 48: Section 3.2.1 - Stormwater Pond Ste
Page 53 and 54: Section 3.2.2 - Extended Dry Detent
Page 59 and 60: Section 3.2.3 - Vegetative Filter S
Page 67 and 68: Section 3.2.4 - Grassed Channel 3.2
Page 69 and 70: Section 3.2.4 - Grassed Channel 3.2
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Section 3.2.4 - Grassed Channel 3.2
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Section 3.2.4 - Grassed Channel max
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Section 3.2.5 - Enhanced Swale 3.2.
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Section 3.2.5 - Enhanced Swale Chan
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Section 3.2.5 - Enhanced Swale B. G
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Section 3.2.5 - Enhanced Swale High
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Section 3.2.5 - Enhanced Swale Side
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Section 3.2.5 - Enhanced Swale 3.2.
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Section 3.2.6 - Infiltration Trench
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Section 3.2.7 - Soakage Trench 3.2.
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Section 3.2.7 - Soakage Trench •
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Section 3.2.8 - Surface Sand Filter
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Section 3.2.9 - Bioretention Areas
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Section 3.2.10 - Stormwater Wetland
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Section 3.3 - Secondary TSS Treatme
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Section 3.3.1 - Proprietary Treatme
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Section 3.3.1 - Proprietary Treatme
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Section 3.3.2 - Gravity (Oil-Water)
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Section 3.3.3 - Alum Treatment 3.3.
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Section 3.3.3 - Alum Treatment •
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Section 3.3.4 - Underground Sand Fi
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Section 3.3.5 - Organic Filter 3.3.
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Section 3.3.5 - Organic Filter •
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Section 3.4 - Other Stormwater Mana
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Section 3.4.1 - Conventional Dry De
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Section 3.4.2 - Underground Dry Det
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Section 3.4.3 - Porous Pavement 3.4
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Section 3.4.3 - Porous Pavement The
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Section 3.4.3 - Porous Pavement com
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Section 3.4.3 - Porous Pavement Fig
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Section 3.4.4 - Modular Porous Pave
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Section 3.4.5 - Green Roof 3.4.5 Gr
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Section 3.4.5 - Green Roof Signific
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Section 3.4.5 - Green Roof 3.4.5.3
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Volume 2-05, Chapter 3 - City of Wichita

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